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Issue No. 5, Article 1/April 25, 2008

Black Cutworm and Armyworm Update (with News About "The Hines Report")

Over the past week, we received several reports from University of Illinois Extension educators regarding scattered captures of black cutworm adults in pheromone traps as far north as Ogle, Whiteside, and Winnebago counties. Intense captures (9 or more moths captured over 2 days) were reported by crop systems educators in Adams County (9 moths on April 20) and Ogle County (3 moths on April 17, 7 moths on April 18). Although not included in the formal network in southern Illinois (see the next paragraph), a trap in Massac County captured 10 moths on April 18, indicating yet another intense capture. Numerous intense captures have been reported through the University of Missouri IPM Pest Monitoring Network.

Based on this rather small number of intense captures, cutting by 4th-instar black cutworms may occur in Illinois between May 12 (southern) and May 20 (northern). Warmer temperatures could change these projections, but at least we have some dates to consider in the near future.

The small network of insect-monitoring traps in southern Illinois (organized by Ron Hines, Growmark's seed agronomist for the southern region) is now in operation. The latest details are available in "The Hines Report" on the University of Illinois IPM Web site (ipm.uiuc.edu/pubs/hines_report); you can view reports from traps in five counties: Franklin, Marion, Pulaski, Sangamon, and St. Clair. Once again, I thank Ron for his efforts.

Captures of armyworm adults continue to increase in two pheromone traps in Kentucky, and armyworm adults have been captured in traps in Illinois located as far north as Sangamon County. Wheat fields and grass pastures will be most at risk if numbers of armyworm larvae are large this spring, so producers need to be particularly alert within a couple of weeks, even though much of their attention will be focused on planting corn and soybeans.--Kevin Steffey

Author:
Kevin Steffey

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